Opera 12.17 closes down when video streamed

In Opera 12.17 under Windows 7, the browser closes down whenever a video stream is started. Stays open if the site with video is closed. No changes have been made and has worked OK till today. Does anyone have any clues?

Analyze the amount of threads complaining about simple problems in Presto. Add this to the fact that the team of developers works give 100% attention to Opera Blink. And yet, consider the fact that the code Presto is restricted.

I have installed Presto here was my favorite browser, but it's languishing.